Xue Duan

Beijing University of Chemical Technology, Peping, Beijing, China

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Publications (324)1528.03 Total impact

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    ABSTRACT: A new targeted photothermal agent used in cancer photothermal therapy (PTT) is synthesized by co-intercalation of indocyanine green (ICG) and targeting folic acid (FA) into the interlamellar gallery of layered double hydroxide (LDH). The resulting composite material (ICG-FA/LDH) possesses an interlayer distance of 2.503 nm, and a uniform particle size with an equivalent hydrodynamic diameter of 127 nm. ICG presents a monomeric state in the LDH gallery, owing to the supermolecular interactions between the LDH host and ICG guest, which results in a largely-enhanced photothermal conversion efficiency. In vitro tests performed with KB cells demonstrate a highly enhanced cellar uptake and excellent imaging ability for the ICG-FA/LDH. The photothermal conversion studies show that an ultra-low dosage of ICG-FA/LDH (equivalent ICG 10 μg/mL) under a weak near-infrared (NIR) irradiation (8 min; 1.1 W/cm2) achieves a significant temperature increase from 19.8 °C to 51.0 °C. Therefore, a satisfactory in vitro PTT effectiveness of the ICG-FA/LDH composite is obtained, which exhibits a cellular damage as high as 87.4% with an ultra-low dosage of ICG (8 μg/mL) and weak NIR irradiation (1.1 W/cm2, 12 min). In addition, the photothermal agent ICG-FA/LDH displays good targeting capability, biocompatibility and low cytotoxicity. It is expected that the unique ICG-FA/LDH with integrated fluorescence imaging and photothermal therapy can be potentially used in cell labeling and PTT area.
    No preview · Article · Feb 2016 · RSC Advances
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    ABSTRACT: A honeycomb-like carbon-based network is obtained by in situ nucleation and directed growth of MOFs arrays on the surface of LDHs nanoplatelets, followed by a subsequent pyrolysis process, which exhibits largely enhanced electrocatalytic ORR performances. A successful paradigm for the directed growth of highly-oriented MOFs arrays is demonstrated, with potential applications for energy storage and conversion.
    No preview · Article · Jan 2016 · Advanced Materials
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    ABSTRACT: Electrochemical water splitting provides a facile method for high-purity hydrogen production, but the electro-catalysts with stable bifunctional activity towards both oxygen and hydrogen evolution are rarely developed. Herein we report a Fe2Ni2N material with vertically aligned nanoplate arrays architecture as bifunctional catalyst for overall water splitting in alkaline environment. This advanced catalyst affords small onset overpotentials and fast current density increase, resulting in excellent water splitting performance (requiring 1.65 V for achieving 10 mA/cm2), superior to the combination of noble metal catalysts benchmark.
    No preview · Article · Jan 2016
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    ABSTRACT: A layered drug nanovehicle was fabricated via the co-intercalation of doxorubicin (DOX) and folic acid (FA) into the gallery of layered double hydroxides (LDHs). This supermolecular nanovehicle (denoted as DOX-FA/LDHs) demonstrates excellent fluorescence imaging and targeted therapy toward cancer cells. The nanovehicle shows uniform platelet morphology with average diameter of 171 nm. The unique host-guest interactions lead to a high dispersion of DOX, and in vitro tests reveal a legible and strong fluorescence imaging for the sample of DOX-FA/LDHs. In addition, the DOX-FA/LDHs material produces a high anticancer activity toward HepG2 cells but rather low cytotoxicity to the normal cells (L02 cells), as a result of the over-expression of FA to cancer cells. This work provides a facile approach for the design and preparation of drug nanovehicle with significantly enhanced biocompatibility, diagnosis and targeted therapy, which can be potentially applied in medical imaging and chemotherapy.
    No preview · Article · Jan 2016 · Journal of Materials Chemistry B
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    ABSTRACT: Flexible and lightweight wire-shaped supercapacitors (WSSCs) have recently attracted increasing interest, due to their versatility in the device design and application potentials in portable or wearable electronics. However, practical applications of WSSCs are still limited by the relatively poor performances, owing to the challenges in the rational modification of one-dimensional (1D) substrates with sophisticated nanostructure. Herein, we demonstrate a WSSC by virtue of material exploration and fabrication strategy. A 1D nanoarray electrode consisting of CuO nonowires core and CoFe-layered double hydroxide (CoFe-LDH) nanoplatelets shell supported on a copper wire is prepared with fine control over the structure/morphology, which displays a largely improved specific capacitance, high rate capability and long cycling lifespans. Based on this sophisticated core–shell nanostructure, a flexible all-solid-state asymmetric WSSC was fabricated, which exhibits excellent supercapacitive performances with a high energy density (1.857 mWh cm−3) and long-term cycling stability (99.5% device capacitance retention over 2000 cycles).By virtue of the versatility of metal wire substrates, transition metal oxides and LDHs materials, the synthesis strategy presented here can be extended to the fabrication of other portable and flexible micro energy storage devices.
    Full-text · Article · Jan 2016 · Nano Energy
  • Zhiyi Lu · Li Qian · Yang Tian · Yaping Li · Xiaoming Sun · Xue Duan
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    ABSTRACT: Layered double hydroxides (LDHs) are a family of layer materials that receive heightened attention. Herein a ternary NiFeMn-LDH is investigated with superior oxygen evolution activity, which is attributed to the Mn(4+) doping in the intralayer, which modifies the electronic structure and improves the conductivity of the electrocatalyst.
    No preview · Article · Nov 2015 · Chemical Communications
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    ABSTRACT: Two-dimensional (2D) materials have attracted increasing interest in electrochemical energy storage and conversion. As typical 2D materials, layered double hydroxides (LDHs) display large potential in this area due to the facile tunability of their composition, structure and morphology. Various preparation strategies, including in situ growth, electrodeposition and layer-by-layer (LBL) assembly, have been developed to directly modify electrodes by using LDH materials. Moreover, several composite materials based on LDHs and conductive matrices have also been rationally designed and employed in supercapacitors, batteries and electrocatalysis with largely enhanced performances. This feature article summarizes the latest developments in the design, preparation and evaluation of LDH materials toward electrochemical energy storage and conversion.
    Full-text · Article · Oct 2015 · Chemical Communications
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    Full-text · Dataset · Oct 2015
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    ABSTRACT: We report a new synthetic strategy for the fabrication of several supported nickel phosphides (Ni12P5, Ni2P, and NiP2) with particle size ranging from 5 to 15 nm via a two-step procedure: preparation of supported Ni particles from layered double hydroxide precursors, followed by a further reaction with a certain amount of red phosphorus. The selective hydrogenation of phenylacetylene over these metal phosphides was evaluated, and the as-prepared Ni2P/Al2O3 catalyst shows a much higher selectivity to styrene (up to 88.2%) than Ni12P5/Al2O3 (48.0%), NiP2/Al2O3 (65.9%), and Ni/Al2O3 (0.7%) catalysts. EXAFS and in situ IR measurements reveal that the incorporation of P increases the bond length of Ni-Ni, which imposes a key influence on the adsorption state of alkene intermediates: as the Ni-Ni bond length extends to 0.264 nm, the alkene intermediate undergoes di-π(C=C) adsorption, facilitating its desorption and the resulting enhanced selectivity. Moreover, electron transfer occurs from Ni to P, as confirmed by EXAFS, XPS, and in situ CO-IR experiment, in which the positively charged Ni reduces the desorption energy of alkene and thus improves the reaction selectivity.
    No preview · Article · Oct 2015 · ACS Catalysis
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    ABSTRACT: The existence of oxygen vacancies in heterogeneous catalysis plays an essential role in determining the catalytic reactivity of metal catalysts. In this work, Ru nanoparticles were immobilized onto the CeO2 nanocubes (NCs), nanorods (NRs), and nanopolyhedrons (NPs) with the dominantly exposed {1 0 0}, {1 1 0}, and {1 1 1} facet of CeO2 support, respectively. Their catalytic behavior toward CO2 methanation was studied in detail, and the highest catalytic rate per gram of catalyst was obtained over the Ru(3%)/CeO2-NCs catalyst (reaction rate: 4.85 × 10−8 mol gcat−1 s−1; selectivity: 99%; 150 °C). The temperature-programmed reduction (TPR), Raman spectra, and oxygen storage capacity (OSC) test confirm that the Ru(3%)/CeO2-NCs catalyst possesses the highest concentration of oxygen vacancies owing to the Ru-promoted formation of oxygen vacancy on the CeO2-NCs. In addition, in situ infrared spectroscopy measurements demonstrate that the abundant oxygen vacancy in Ru(3%)/CeO2-NCs serves as the active site for CO2 activation, accounting for the significantly enhanced low-temperature reaction rate per gram of Ru/CeO2 catalyst.
    No preview · Article · Sep 2015 · Journal of Catalysis
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    ABSTRACT: A new electrochemical synthesis route was developed for the fabrication of Fe-containing layered double hydroxide (MFe-LDHs, M = Ni, Co and Li) hierarchical nanoarrays, which exhibit highly-efficient electrocatalytic performances for the oxidation reactions of several small molecules (water, hydrazine, methanol and ethanol). Ultrathin MFe-LDH nanoplatelets (200-300 nm in lateral length; 8-12 nm in thickness) perpendicular to the substrate surface are directly prepared within hundreds of seconds (<300 s) under cathodic potential. The as-obtained NiFe-LDH nanoplatelet arrays display promising behavior in the oxygen evolution reaction (OER), giving rise to a rather low overpotential (0.224 V) at 10.0 mA cm-2 with largely enhanced stability, much superior to previously reported electro-oxidation catalysts as well as the state-of-the-art Ir/C catalyst. Furthermore, the MFe-LDH nanoplatelet arrays can also efficiently catalyze several other fuel molecules' oxidation (e.g., hydrazine, methanol and ethanol), delivering a satisfactory electrocatalytic activity and a high operation stability. In particular, this preparation method of Fe-containing LDHs is amenable to fast, effective and large-scale production, and shows promising applications in water splitting, fuel cells and other clean energy devices. This journal is
    No preview · Article · Aug 2015 · Chemical Science
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    ABSTRACT: In this paper, the inexpensive 4,4-diaminostilbene-2,2-disulfonate (DAS) and 4,4-dinitro-stilbene-2,2- disulfonate (DNS) anions with arbitrary molar ratios were successfully co-intercalated into Zn2Al-layered double hydroxides (LDHs). The DAS(50%)-DNS/LDHs composite exhibited the broad UV-visible light absorption and fluorescence quenching, which was a direct indication of photo-induced electron transfer (PET) process between the intercalated DAS (donor) and DNS (acceptor) anions. This was confirmed by the matched HOMO/LUMO energy levels alignment of the intercalated DAS and DNS anions, which was also compatible for water splitting. The DAS(50%)-DNS/LDHs composite was fabricated as the photoanode and Pt as the cathode. Under the UV-visible light illumination, the enhanced photo-generated current (4.67 mA/cm(2) at 0.8 V vs. SCE) was generated in the external circuit, and the photoelectrochemical water split was realized. Furthermore, this photoelectrochemical water splitting performance had excellent crystalline, electrochemical and optical stability. Therefore, this novel inorganic/organic hybrid photoanode exhibited potential application prospect in photoelectrochemical water splitting.
    Preview · Article · Jul 2015 · Scientific Reports
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    ABSTRACT: Phosphonoacetate (PAA), diethyl phosphonoacetate (DPA), and sulfoacetate (SAA) anions have been intercalated into the galleries of the layered double hydroxide (LDH) [LiAl2(OH)6·X]·yH2O (LiAl-X; X = Cl, NO3). X-ray diffraction (XRD), Fourier transform infrared spectroscopy, and elemental microanalysis confirmed the successful intercalation of the guest ions into the LDH. The guests could also be de-intercalated and recovered from the host intact. In situ XRD was used to probe the mechanisms of the reactions, and the intercalation of PAA proceeded via clear intermediate phases. In contrast, the SAA and DPA reactions did not show any intermediates, but the organic intercalates exhibited changes in their interlayer spacing as the reaction progressed. Molecular dynamics (MD) simulations were used to investigate the interlayer structure of the intercalation compounds. It was found that the intermediates observed in situ correspond to local energy minima in the MD simulations. MD can thus predict the course of an intercalation reaction and allow the a priori identification of intermediate phases. This is the first time that in silico and in situ measurements have been combined to unravel this level of understanding of intercalation reactions.
    No preview · Article · Jul 2015 · The Journal of Physical Chemistry C
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    Full-text · Dataset · Jul 2015
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    ABSTRACT: Gold nanoclusters (Au NCs) stand for a new type of fluorescent nanomaterials with outstanding optical properties due to their discrete electronic energy and direct electron transition. However, relative low quantum yield (QY) of Au NCs in aqueous or solid state has limited their photofunctional applications. To improve the fluorescent performances of Au NCs and find an effective approach for the fabrication of Au NCs-based films, in this work, Au NCs are localized onto 2D layered double hydroxides (LDHs) nanosheets via a layer-by-layer assembly process; the as-fabricated (Au NCs/LDH)n ultrathin films (UTFs) show an ordered and dense immobilization of Au NCs. The localization and confinement effects imposed by LDH nanosheets induce significantly increased emissive Au(I) units as confirmed by X-ray photoelectron spectroscopy and periodic density functional theoretical simulation, which further results in promoted QY (from 2.69% to 14.11%) and prolonged fluorescence lifetime (from 1.84 µs to 14.67 µs). Moreover, the ordered (Au NCs/LDH)n UTFs exhibit well-defined temperature-dependent photoluminescence (PL) and electrochemiluminescence (ECL) responses. Therefore, this work supplies a facile strategy to achieve the immobilization of Au NCs and obtain Au NCs-based thin films with high luminescent properties, which have potential applications in PL and ECL temperature sensors.
    No preview · Article · Jul 2015 · Advanced Functional Materials
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    Full-text · Dataset · Jun 2015
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    ABSTRACT: Transparent and flexible gas-barrier materials have shown broad applications in electronics, food, and pharmaceutical preservation. Herein, we report ultrahigh-gas-barrier films with a brick-mortar-sand structure fabricated by layer-by-layer (LBL) assembly of XAl-layered double hydroxide (LDH, X=Mg, Ni, Zn, Co) nanoplatelets and polyacrylic acid (PAA) followed by CO2 infilling, denoted as (XAl-LDH/PAA)n -CO2 . The near-perfectly parallel orientation of the LDH "brick" creates a long diffusion length to hinder the transmission of gas molecules in the PAA "mortar". Most significantly, both the experimental studies and theoretical simulations reveal that the chemically adsorbed CO2 acts like "sand" to fill the free volume at the organic-inorganic interface, which further depresses the diffusion of permeating gas. The strategy presented here provides a new insight into the perception of barrier mechanism, and the (XAl-LDH/PAA)n -CO2 film is among the best gas barrier films ever reported. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
    No preview · Article · Jun 2015 · Angewandte Chemie International Edition
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    ABSTRACT: A supramolecular nanovehicle (denoted as SNV) was fabricated by encapsulating zinc phthalocyanine (ZnPc) and doxorubicin (DOX) into a copolymer (PVP-b-PAA-g-FA), so as to achieve systematic and synergistic chemotherapy-photodynamic therapy (PDT), targeted tumor imaging and therapy. The sophisticated copolymer designed in this work can load the PDT photosensitizer (ZnPc) and chemotherapy drug (DOX) simultaneously, which exhibits an excellent performance in chemotherapy- PDT targeted cancer and tumor therapy for both in vitro studies performed with HepG2 cells and in vivo tests with mice. This work provides a new drug formulation with a chemotherapy-PDT synergistic effect by virtue of the supramolecular material design, which possesses the advantages of an ultra-low drug dosage and highly-efficient in vivo targeted tumor imaging/therapy.
    Full-text · Article · Jun 2015 · Chemical Science
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    ABSTRACT: A supramolecular nanovehicle (denoted as SNV) by encapsulating zinc phthalocyanine (ZnPc) and doxorubicin (DOX) into an amphiphilic copolymer (PVP-b-PAA-g-FA), so as to achieve systematic and synergistic chemotherapy-photodynamic therapy (PDT) targeted tumor imaging and therapy. The sophisticated copolymer designed in this work can load the PDT photosensitizer (ZnPc) and chemotherapy drug (DOX) simultaneously, which exhibits an excellent performance in chemotherapy-PDT targeted cancer and tumor therapy both in vitro studies performed with HepG2 cell and in vivo tests over mice. This work provides a new drug formulation on chemotherapy-PDT synergistic effect by virtue of supramolecular material design, which takes the advantages of ultra-low drug dosage and highly-efficient in vivo targeted tumor imaging/therapy.
    Full-text · Article · Jun 2015 · Chemical Science
  • Mingfei Shao · Min Wei · David G. Evans · Xue Duan
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    ABSTRACT: Layered double hydroxide (LDH)-based photocatalysts have attracted great attention in the fields of environment and energy (e.g., degradation of pollutants, water splitting for solar fuel production), owing to their unique intercalation structure with highly dispersed metal cations and exchangeable anions, large specific surface areas, and remarkable adsorption capacities. This chapter aims to review and summarize the recent advances in the synthesis and photocatalytic applications of LDH-based materials. Typically, several important strategies have been developed for the fabrication of LDH-based photocatalysts by tuning the composition of the host layers, intercalating guest sensitizers, and constructing nanocomposites. The obtained photocatalysts exhibit excellent performances in the fields of pollutant degradation, water splitting, and reduction of CO2 into carbon sources. The fabrication and application of LDH-based photocatalysts represent a promising direction in the development of LDH-based multifunctional materials, which will contribute to the progress of chemistry and material science.
    No preview · Article · Jun 2015 · Structure and Bonding

Publication Stats

10k Citations
1,528.03 Total Impact Points

Institutions

  • 2000-2016
    • Beijing University of Chemical Technology
      • College of Materials Science and Engineering (SMSE)
      Peping, Beijing, China
  • 2003
    • Beijing University of Aeronautics and Astronautics (Beihang University)
      Peping, Beijing, China